3RT2015-2JB42

It is a J-type coupling contactor line, with a 24V DC coil and spring terminals. The diode is built-in and fixed (not external). It is configured with normally closed (1NC) auxiliary contacts in accordance with the convention of the same series of models.

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Siemens 3RT2015-2JB42 Coupling Contactor 24VDC with Built-in Diode 1NC

Product Positioning

The 3RT2015-2JB42 belongs to the "J" rail model of the SIRIUS 3RT2015 coupling contactor. Its biggest difference from the external diode K rail (such as 2KB42/2KB41) is that the diode is "integrated" inside the coil and cannot be replaced. This results in a more compact and sealed structure, suitable for applications where on-site diode replacement is not required but simpler contact points are needed. The coil is 24V DC, and the terminals use a spring-loaded design. Verification of the 1NO model 2JB41 in the same series has confirmed from multiple sources that it is 24V DC, has an integrated diode, and uses spring terminals. Regarding the auxiliary contacts' normally closed/normally open configuration, following Siemens' order code convention (the last two digits of the model number correspond to normally closed and 41 to normally open, cross-verified across multiple models such as 1BB42/1BB41, 2KB42/2KB41, and 2FB42), this model should have one set of normally closed (1NC) auxiliary contacts. However, as of now, no independent dealer list page for the 2JB42 has been found, and details such as weight and dimensions are currently unavailable. It is recommended to confirm the final drawings with Siemens or Kensington Motors before placing an order.

Core Product Advantages and Features

Built-in surge suppression diode

The diode is integrated inside the coil and is not an external replacement type. Its compact structure makes it suitable for long-term stable applications that do not require on-site replacement of diode components.

24V DC coil, spring terminal

Continuing the 24V DC control voltage and spring-loaded terminal design of the coupling contactor series, the wiring efficiency is consistent with the same series.

Normally closed contacts are configured according to model convention.

According to Siemens' consistent naming convention in order codes, where '42' corresponds to normally closed and '41' corresponds to normally open, the auxiliary contact of this model should be 1NC.

S00 frame, PLC signal intermediary

Continuing the S00 minimum frame and coupling contactor positioning, it is suitable as an intermediate isolation element for PLC output signals in the control box.

project	Specification
Product Positioning	Coupling contactor relay, J-rail with built-in diode.
Series/Framework	SIRIUS 3RT2015, S00 (Minimum Frame)
Number of poles/main contacts	3 poles, 3NO
AC-3 rated current	7 A
AC-3 rated power	3 kW / 400 V
Coil Specifications	24 V DC
Surge suppression	Built-in surge suppression diode, not external type
auxiliary contacts	1NC (presumably based on naming conventions within the same series of models)
Terminal type	Spring-type terminals
Rated insulation voltage Ui	690 V
Protection level	IP20 (front of terminal)
Ambient temperature	Operating temperature: -25~+60°C / Storage temperature: -55~+80°C
Applicable Standards	IEC 60947-4-1, etc.
Remark	A list of independent distributors is not yet available; weight/size details are pending confirmation.

Recommend

3RT2015-2KB41

It belongs to the same coupling contactor series as 2KB42, with a 24V DC coil and a pluggable surge suppression diode. The difference is that the auxiliary contacts are changed to a set of normally open (1NO), while the spring terminal design is the same.

3RT2015-2JB41

The J-type coupling contactor integrates the 24V DC coil and diode into a fixed design, with spring terminals and a built-in set of normally open (1NO) auxiliary contacts. The actual measured weight is approximately 0.315 kg.

3RT2015-2FB42

Unlike the coupling contactor series, this model is classified as a general power contactor. It has a built-in diode and spring terminal in a 24V DC coil and is equipped with one set of normally closed (1NC) auxiliary contacts. It weighs approximately 0.314 kg.